CPS1 MERCS freezing

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Rocco
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Joined: February 7th, 2016, 10:51 pm
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CPS1 MERCS freezing

Post by Rocco »

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I bought this game some months ago , but the lack of TATE cabinet didn't let me play it ...

Game starts normally , credit OK but if I touch TEST or any action buttons , the game gets freeze.


What could be the problem?

I tried 2 CPS Base boards ,same result .
And those base boards works perfect with other games ...
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Asayuki
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Re: CPS1 MERCS freezing

Post by Asayuki »

The issue is on the B board, where the code EPROMs are. Try carefully reseating them as a first thing. Be warned that the C board has a suicide battery. You don't want to fiddle with it.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
Rocco
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Location: Navarra

Re: CPS1 MERCS freezing

Post by Rocco »

Asayuki wrote:The issue is on the B board, where the code EPROMs are. Try carefully reseating them as a first thing. Be warned that the C board has a suicide battery. You don't want to fiddle with it.

Do you mean pressing stronger eprom to socket with my fingers ?


Thanks for your help
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nem
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Re: CPS1 MERCS freezing

Post by nem »

Reseating means pulling them off and putting them back in.

Is there a chance of it suiciding if the program roms are removed?
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Asayuki
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Re: CPS1 MERCS freezing

Post by Asayuki »

nem wrote:Is there a chance of it suiciding if the program roms are removed?
AFAIK the battery is only connected to the big QFP chip on the bottom of the C board. Hands off that thing.
However, Leonard is the real CPS expert; please correct me if I'm wrong, pal.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
Rocco
Posts: 586
Joined: February 7th, 2016, 10:51 pm
Location: Navarra

Re: CPS1 MERCS freezing

Post by Rocco »

Asayuki wrote:The issue is on the B board, where the code EPROMs are. Try carefully reseating them as a first thing. Be warned that the C board has a suicide battery. You don't want to fiddle with it.

Thanks for the hint , do I need to take off the bigger EPROMs and re-install all again ?
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Asayuki
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Re: CPS1 MERCS freezing

Post by Asayuki »

Yes,
see this page, line 5527:
https://git.redump.net/mame/tree/src/ma ... s/cps1.cpp
The names of the files will make you understand which are the ROMs to unplug and replug. Be careful not to bend any pin.
My 15kHz cabinet Peplos will never power up, with any item, and I am quite proud of that.
Asure
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Re: CPS1 MERCS freezing

Post by Asure »

Mercs has no battery on the C board. You want to check 11F, 12F 11H and 12H eproms. They are in a cluster of 4 in the corner below the C board.
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